Model plane having radiating means

ABSTRACT

A model plane having a means for radiating heat generated by a dry cell mounted on said model plane for a power source of a miniature electric motor by which the model plane is adapted to fly in the air, to work the dry cell at its top capacity.

I Wnited States Patent 11 1 1111 3,738,05 Mabuchi 1 1 June 12,1973

1 1 MODELPLANE HAVING RADIATING [56] References Cited MEANS UNITED STATES PATENTS [75] Inventor: Kenichi Mabuchi, Tokyo, Japan 3,027,682 4/1962 Schlau 136/173 X [73] Assigneei Mabuchi Motor Co Ltd. Tokyo 3,000,999 9/1961 Schlau 136/173 Ja an 1 p Primary Examiner--Louis G. Mancene [22] Flled: 2, 1971 Assistant Examiner-D. L. Weinhold 2 App] NOJ 204 039 AttorneyStaas, Halsey & Gable [30] Foreign Application Priority Data [57] ABSTRACT Dec. 4, 1970 Japan 45 120390 A model Plane having a means for radiating heat gener- Dec. 4, 1970 Japan v. 45/120391 ated y a y cell mounted on said model plane for a power source of a miniature electric motor by which 52 us. (:1. 46/243 AV, 46/78, 46/45, the model plane is adapted to y in the air, to work the 136/173 dry cell at its top capacity. [51] Int. Cl A63h [58] Field 61 Search 46/243 AV, 78, 45; 2 4 Drawmg Fgms PAIEIHEM I 1 MODEL PLANE HAVING RADIATING MEANS The present invention relates to a model plane having a means for radiating heat generated by a dry cell mounted on said model plane for a power source of a miniature electric motor by which said model plane is adapted to fly in the air.

It is well known that a dry cell will generate heat after it has been used continuously for a certain period of time and it is also widely known that the voltage of the dry cell will be lowered and accordingly that the output thereof will be reduced due to such heat generation of the dry cell. In this connection, it is to be noted that a dry cell to be mounted on a model, especially a dry cell to be mounted on a model plane should be small but powerful because the model plane itself is required to be small and light and requires a large current to fly. To keep the dry cell powerful or to work it at the top capacity, the heat generated must be radiated. However, no attention has been paid to such heat radiation and no model plane having a miniature electric motor and a dry cell mounted thereon to fly in the air has been made before a copending patent application (Japanese Patent application No. 106019/70).

It is another object of the present invention to provide a model plane having a radiating means of the kind which is disposed in the model plane so that the longitudinal direction of the fins of the radiating means may be in parallel with the proceeding direction or longitudinal direction of the model plane to reduce resistance of air and promote a cooling effect.

It is a further object of the present invention to provide a model plane having a radiating means of the-kind which is removably mounted on a holder of a specified shape fixed to the body of the model plane.

Essentially, according to the present invention, there is provided a model plane having a means for radiating heat generated by a dry cell mounted on said model plane for a power source of a miniature electric motor by which the model plane is adapted to fly in the air, said radiating means comprisinga plate formed in a cylindrical shape with a slit being left between the ends thereof to hold the dry cell forcibly inserted therein and a plurality of fins formed on the periphery of the plate and being disposed in the model plane in the arrangement that the longitudinal direction of the fins is in parallel with the longitudinal direction of the model plane. The invention will be better understood from the following description taken in connection withthe accompanying drawings in which:

FIG. 1 is an explanatory side view of a model plane having a radiating means mounted thereon according to the present invention;

FIG. 2 is an explanatory view of the radiating'means, showing the relationship between said radiating means and a dry cell;

FIG. 3 is a longitudinal sectional view of the radiating means with the dry cell inserted therein; and

FIG. 4 is an explanatory perspective view of the radiating means, showing the relationship between said radiating means and a holder.

Referring now to FIGS. 1 to 3, there is illustrated one form of the model plane having a radiating means embodying the present invention. Numeral l designates a body of a model plane adapted to fly in the air by means of a miniature electric motor (not shown) and a dry cell 3 used as a power source of said motor which are mounted on said model plane. Numeral 2 indicates a means for radiating the heat generated by the dry cell 3 after a continuous operation. In the model plane according to the present invention, preferably a rechargeable dry cell is employed. The radiating means 2 is made ofa light metal such as an aluminium or an aluminum alloy and has a plate 2b formed in a cylindrical shape with a slit left between the ends of said plate 2b or a casing of the dry cell and a plurality of fins 20 formed radially on the periphery of the cylindrically formed plate 2b or the casing of the dry cell. The dry cell 3 is forcibly inserted into said cylindrically formed plate 2b or the casing thereof.

The radiating means 2 may, as shown in FIG. 1, be fixed to the body of the model plane through an appropriate means but should be disposed so that the longitudinal direction of the fins 2c of the radiating means 2 may be in parallel with the proceeding direction or longitudinal direction of the model plane.

FIG. 4 shows one example of the means for fixing the radiating means 2 to the body 1 of the model plane. Numeral 4 designates a holder made of plastics such as a vinyl chloride. Said holder 4 comprises a base portion 4a and inwardly slanting side walls 4b. At the base portion 4a of the holder 4, it is secured to the body 1 of the model plane. The radiating means 2 is held by said holder 4 with its two adjacent fins 2c engaged with the insides of said inwardly slanting side walls 4b.

The holder 4 is fixed along its length to the body 1 of the model plane in the direction parallel with said body 1. Thus, the fins 2c are disposed along its length in parallel with the length of the body 1.

Saidholder 4 may be formed longer for receiving and holding a plurality of radiating means 2 with dry cells inserted therein. therefore; i

As mentionedabove, according to the present invention, the heat generated after a continuous use of the dry cell is radiated through the radiating means to prevent a possible voltage drop of the dry cell due to the heat generation; the air resistance of the radiating means is minimized by disposing the radiating means so that the longitudinal direction of the fins thereof may be inparallel with the longitudinal direction of the model plane; the space to be occupied by said radiating means is reduced by utilizing the casing of the dry cell therefor, and the radiating means can be readily mounted on and easily removed from the body of the model plane through the holder.

What is claimed is:

1. A model plane having a means for radiating heat generated by a dry cell mounted on said model plane for a power source of aminiature electric motor by which the model plane is adapted to fly in the air, said radiating means comprising a plate formed in a cylindrical shape with a slit being left between the ends thereof to hold the dry cell forcibly inserted therein and a plurality of fins formed on the periphery of the plate and being disposed in the model plane in the arrange- 4 the holder is in parallel with the longitudinal direction of the model plane to receive and hold the radiating means by its slanting side walls engageable with any ad- 5 jacent two fins of the radiating means. 

1. A model plane having a means for radiating heat generated by a dry cell mounted on said model plane for a power source of a miniature electric motor by which the model plane is adapted to fly in the air, said radiating means comprising a plate formed in a cylindrical shape with a slit being left between the ends thereof to hold the dry cell forcibly inserted therein and a plurality of fins formed on the periphery of the plate and being disposed in the model plane in the arrangement that the longitudinal direction of the fins is in parallel with the longitudinal direction of the model plane.
 2. A model plane as claimed in claim 1, which further comprises a holder having a base portion and slanting side walls, said holder being fixed to the model plane in the arrangement that the longitudinal direction of the holder is in parallel with the longitudinal direction of the model plAne to receive and hold the radiating means by its slanting side walls engageable with any adjacent two fins of the radiating means. 